There is a chap called Mark Colchester Bike Park on Facebook, who has just start turning Chitts Hill/Iron Latch Woods/Halstead Woods (all the same place) into a mini bike park. There has been drops, jumps and Singletrack there for a while, but they have already started adding to it. I was there last Wedneaday and they have added a very jumpy track finishing with several berms, plus there is are a couple of singletrack options running through the woods. It’s not big, but can be linked up with trails in Hill House Woods in West Bergholt, Lexden Gathering Nature Reserve and up to the Hilly Fields, with minimal road riding. I managed 22 miles the other day linking all of those together.
Don’t both with High Woods its really dull and full of loads of dog walkers.